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Pronunciation |
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(PRA
ze
pam) |

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U.S. Brand
Names |
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Centrax® |

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Generic
Available |
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Yes |

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Pharmacological Index |
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Benzodiazepine |

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Use |
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Treatment of anxiety |

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Pregnancy Risk
Factor |
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D |

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Contraindications |
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Hypersensitivity to this drug or any component of its formulation
(cross-sensitivity with other benzodiazepines may exist); narrow-angle glaucoma;
pregnancy |

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Warnings/Precautions |
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Use with caution in elderly or debilitated patients, patients with hepatic
disease (including alcoholics), or renal impairment. Use with caution in
patients with respiratory disease, or impaired gag reflex. Avoid use in patients
with sleep apnea.
Use caution in patients with depression, particularly if suicidal risk may be
present. Use with caution in patients with a history of drug dependence.
Benzodiazepines have been associated with dependence and acute withdrawal
symptoms on discontinuation or reduction in dose. Acute withdrawal, including
seizures, may be precipitated after administration of flumazenil to patients
receiving long-term benzodiazepine therapy.
Benzodiazepines have been associated with anterograde amnesia. Paradoxical
reactions, including hyperactive or aggressive behavior have been reported with
benzodiazepines, particularly in adolescent/pediatric or psychiatric patients.
Does not have analgesic, antidepressant, or antipsychotic properties.
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Adverse
Reactions |
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Cardiovascular: Hypotension
Central nervous system: Drowsiness, fatigue, impaired coordination,
lightheadedness, memory impairment, insomnia, depression, headache, anxiety,
confusion, nervousness, syncope, dizziness, akathisia, drowsiness, ataxia,
lightheadedness, vivid dreams
Dermatologic: Rash, pruritus
Endocrine & metabolic: Decreased libido, menstrual irregularities
Gastrointestinal: Xerostomia, constipation, diarrhea, decreased salivation,
nausea, vomiting, increased or decreased appetite, increased salivation, weight
gain or loss
Hematologic: Blood dyscrasias
Neuromuscular & skeletal: Dysarthria, tremor, muscle cramps, rigidity,
weakness, reflex slowing
Ocular: Blurred vision, increased lenticular pressure
Otic: Tinnitus
Respiratory: Nasal congestion, hyperventilation
Miscellaneous: Diaphoresis, drug dependence |

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Drug
Interactions |
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Decreased therapeutic effect: Carbamazepine, rifampin, rifabutin may enhance
the metabolism of prazepam and decrease its therapeutic effect; consider using
an alternative sedative/hypnotic agent
Increased toxicity: Cimetidine, ciprofloxacin, clarithromycin, clozapine, CNS
depressants, diltiazem, disulfiram, digoxin, erythromycin, ethanol, fluconazole,
fluoxetine, fluvoxamine, grapefruit juice, isoniazid, itraconazole,
ketoconazole, labetalol, levodopa, loxapine, metoprolol, metronidazole,
miconazole, nefazodone, omeprazole, phenytoin, rifabutin, rifampin,
troleandomycin, valproic acid, verapamil may increase the serum level and/or
toxicity of prazepam; monitor for altered benzodiazepine response
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Mechanism of
Action |
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Binds to stereospecific benzodiazepine receptors on the postsynaptic GABA
neuron at several sites within the central nervous system, including the limbic
system, reticular formation. Enhancement of the inhibitory effect of GABA on
neuronal excitability results by increased neuronal membrane permeability to
chloride ions. This shift in chloride ions results in hyperpolarization (a less
excitable state) and stabilization. |

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Pharmacodynamics/Kinetics |
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Duration: 48 hours
Serum half-life:
Parent drug: 78 minutes
Desmethyldiazepam: 30-100 hours |

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Usual Dosage |
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Adults: Oral: 30 mg/day in divided doses, may increase gradually to a maximum
of 60 mg/day |

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Dental Health: Local
Anesthetic/Vasoconstrictor
Precautions |
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No information available to require special precautions |

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Dental Health:
Effects on Dental Treatment |
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>10% of patients experience dry mouth which disappears with cessation of
drug therapy |

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Patient
Information |
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Avoid alcohol and other CNS depressants; avoid activities needing good
psychomotor coordination until CNS effects are known; drug may cause physical or
psychological dependence; avoid abrupt discontinuation after prolonged
use |

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Dosage Forms |
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Capsule: 5 mg, 10 mg, 20 mg
Tablet: 5 mg, 10 mg |

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